the pentagon is looking into his email communications with jill kelley, the florida socialite whose complaints uncovered the petraeus affair. >>> that scandal highlights the insecurity of e-mails but there are more ways than ever to hide sensitive documents and erase your footsteps. cbs 5 reporter len ramirez shows us how. >> this tape will self-destruct in five seconds. >>> reporter: there has always been a need to protect sensitive information. whether it's a corporation dealing with trade secrets or a former general trying to hide an adulterous affair. but in today's world where an increasing number of gmails and hotmails are being stored on servers in the cloud, our information is more vulnerable than ever. >> the biggest concern is the security of the information in the cloud. >> reporter: cybercloud based in san jose has been doubling in size in the last two years by creating software that encrypts email to make it unreadable to any outsider with prying eyes. >> if you not going through our gateway -- >> reporter: it's designed as a business security solution. >> consumer data, mortgage